Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.082.50-2.80
1
7.18
👆🏻
Fracture
Uneven, Irregular, Conchoidal
-
Cleavage
None
Perfect
Mohs Hardness
6.55-6.5
2
10
👆🏻
Chemical Composition
Ca 3Al 2(SiO 4) 3-x(OH) 4x (x=0.2 to 1.5)Anthony et al , Handbook of mineralogy (2001)
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)